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+.. Copyright (c) <2020>, Intel Corporation
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   - Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+   - Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
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+     distribution.
+
+   - Neither the name of Intel Corporation nor the names of its
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+     from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+   OF THE POSSIBILITY OF SUCH DAMAGE.
+
+==========================================================
+DMA-accelerated Tx operations for vhost-user PMD test plan
+==========================================================
+
+Overview
+--------
+
+This feature supports to offload large data movement in vhost enqueue operations
+from the CPU to the I/OAT device for every queue. Note that I/OAT acceleration
+is just enabled for split rings now. In addition, a queue can only use one I/OAT
+device, and I/OAT devices cannot be shared among vhost ports and queues. That is,
+an I/OAT device can only be used by one queue at a time. DMA devices used by
+queues are assigned by users; for a queue without assigning a DMA device, the
+PMD will leverages librte_vhost to perform vhost enqueue operations. Moreover,
+users cannot enable I/OAT acceleration for live-migration. Large copies are
+offloaded from the CPU to the DMA engine in an asynchronous manner. The CPU just
+submits copy jobs to the DMA engine and without waiting for DMA copy completion;
+there is no CPU intervention during DMA data transfer. By overlapping CPU
+computation and DMA copy, we can save precious CPU cycles and improve the overall
+throughput for vhost-user PMD based applications, like OVS. Due to startup overheads
+associated with DMA engines, small copies are performed by the CPU.
+
+We introduce a new vdev parameter to enable DMA acceleration for Tx
+operations of queues:
+ - dmas: This parameter is used to specify the assigned DMA device of
+   a queue.
+ - dmathr: If packets length >= dmathr, leverage I/OAT device to perform memory copy;
+   otherwise, leverage librte_vhost to perform memory copy.
+
+Here is an example:
+ $ ./testpmd -c f -n 4 \
+   --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@80:04.0],dmathr=1024'
+
+Test Case 1: PVP Split all path with DMA-accelerated vhost enqueue
+==================================================================
+
+Packet pipeline: 
+================
+TG --> NIC --> Vhost --> Virtio--> Vhost --> NIC --> TG
+
+1. Bind one cbdma port and one nic port to igb_uio, then launch vhost by below command::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 2-3 --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=1,dmas=[txq0@80:04.0],dmathr=1024' \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
+     set fwd mac
+     start
+
+2. Launch virtio-user with inorder mergeable path::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+3. Send packets with packet size [64,1518] from packet generator, check the throughput can get expected data, restart vhost port, then check throughput again::
+
+    testpmd>show port stats all
+    testpmd>stop
+    testpmd>start
+    testpmd>show port stats all
+
+4. Relaunch virtio-user with mergeable path, then repeat step 3::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=0,queues=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+5. Relaunch virtio-user with inorder non-mergeable path, then repeat step 3::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0in_order=1,queues=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+6. Relaunch virtio-user with non-mergeable path, then repeat step 3::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 5-6 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,queues=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+7. Relaunch virtio-user with vector_rx path, then repeat step 3::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 5-6 --socket-mem 1024,1024 \
+    --legacy-mem --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=0,in_order=0,queues=1 \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024
+    >set fwd mac
+    >start
+
+Test Case2: Dynamic queue number test for DMA-accelerated vhost Tx operations
+=============================================================================
+
+1. Bind two cbdma port and one nic port to igb_uio, then launch vhost by below command::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 28-29  --socket-mem 1024,1024 --legacy-mem \
+    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=2,client=1,dmas=[txq0@80:04.5;txq1@80:04.6],dmathr=1024' \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=2 --rxq=2
+     set fwd mac
+     start
+
+2. Launch virtio-user by below ccd ommand::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 30-31 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=2,server=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024 --txq=2 --rxq=2
+    >set fwd mac
+    >start
+
+3. Send packets with packet size [64,1518] from packet generator with random ip, check perforamnce can get target and RX/TX can work normally in two queues.
+
+4. On virtio-user side, dynamic change rx queue numbers from 2 queue to 1 queues, then check one queue RX/TX can work normally::
+
+     start
+     stop
+     port stop all
+     port config all rxq 1
+     port start all
+     start
+
+5. Relaunch virtio-user with queues=2, check RX/TX can work normally in two queues::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 30-31 --no-pci --file-prefix=virtio \
+    --vdev=net_virtio_user0,mac=00:01:02:03:04:05,path=/tmp/s0,mrg_rxbuf=1,in_order=1,queues=2,server=1 \
+    -- -i --tx-offloads=0x0 --enable-hw-vlan-strip --nb-cores=1 --txd=1024 --rxd=1024 --txq=2 --rxq=2
+    >set fwd mac
+    >start
+
+4. On vhost side, dynamic change rx queue numbers from 2 queue to 1 queues, then check one queue RX/TX can work normally::
+
+     start
+     stop
+     port stop all
+     port config all rxq 1
+     port start all
+     start
+
+6. Relaunch vhost with another two cbdma channels, check perforamnce can get target and RX/TX can work normally in two queueus::
+
+    ./x86_64-native-linuxapp-gcc/app/testpmd -n 4 -l 28-29  --socket-mem 1024,1024 --legacy-mem \
+    --file-prefix=vhost --vdev 'net_vhost0,iface=/tmp/s0,queues=2,client=1,dmas=[txq0@80:04.0],dmathr=512' \
+    -- -i --nb-cores=1 --txd=1024 --rxd=1024 --txq=2 --rxq=2
+    >set fwd mac
+    >start
